When is ExportEntry in MAC called

Hello!

I'm very new to MIM so this is very basic question.

I just wonder what is the condition that ExportEntry is called. Here is the code

public void ExportEntry(ModificationType modificationType, string[] changedAttributes, CSEntry csentry)
        {
            switch (modificationType.ToString())
            {
                case "Add":
                    string type = "standard-adm";

                    if (csentry["homeDirFull"].IsPresent && csentry["homeDir"].IsPresent)
                    {
                        fimShrHomeDir.ExportHomeDirEntryAdd(csentry, "vaggeryd.se", "vaggeryd", type);
                    }

                    break;
            }
        }

//Tony